Multiple Choice
What is the total number of principal energy levels that are completely filled in an atom of magnesium (atomic number 12)?
80
views
10. Periodic Properties of the Elements
The Electron Configuration
Multiple Choice
Which of the following electron configurations correctly represents the placement of electrons around a nitrogen atom?
A
1s^2 2s^1 2p^4
B
1s^2 2s^2 2p^5
C
1s^2 2s^2 2p^6
D
1s^2 2s^2 2p^3
Verified step by step guidance1
Step 1: Identify the atomic number of nitrogen, which is 7. This means a neutral nitrogen atom has 7 electrons to place in its electron configuration.
Step 2: Recall the order in which electrons fill atomic orbitals: first the 1s orbital, then the 2s orbital, followed by the 2p orbitals.
Step 3: Fill the 1s orbital with 2 electrons, since it can hold a maximum of 2 electrons: \$1s^{2}$.
Step 4: Fill the 2s orbital with 2 electrons, as it also holds a maximum of 2 electrons: \$2s^{2}$.
Step 5: Place the remaining 3 electrons in the 2p orbitals, which can hold up to 6 electrons, resulting in \$2p^{3}\(. Thus, the full electron configuration is \)1s^{2} 2s^{2} 2p^{3}$.
Related Videos
Related Practice
